Tamil Nadu thunderstorm alert: Winds up to 50 kmph, heavy rain forecast Monday
Synopsis
Tamil Nadu is caught between two extremes — a sharp temperature spike pushing Nagapattinam to 40°C, and an incoming belt of thunderstorms with 50 kmph winds set to sweep interior districts from Monday. The upper-air cyclonic circulation over the Bay of Bengal is the common trigger, and conditions are expected to intensify through Tuesday across a widening district belt.
Key Takeaways
The Regional Meteorological Centre (RMC) has issued a thunderstorm and gusty wind alert for Tamil Nadu on 15 June .
Winds of up to 50 kmph are forecast in Tiruchirappalli , Perambalur , Ariyalur , Namakkal , and Salem on Monday.
Heavy rain and strong winds are expected to extend to 9 districts including Thanjavur , Tiruvarur , and Mayiladuthurai on Tuesday.
Nagapattinam recorded the state's highest temperature at approximately 40 degrees Celsius on Sunday.
Chennai is expected to see partly cloudy skies with a maximum temperature near 39 degrees Celsius on Monday.
An upper-air cyclonic circulation over the Bay of Bengal at 3.1–4.5 km altitude is driving the weather system.
The Regional Meteorological Centre (RMC) has forecast moderate rainfall, thunderstorms, and gusty winds reaching up to 50 kmph across several districts of Tamil Nadu on Monday, 15 June, even as temperatures across the state have surged sharply after a brief period of milder weather. The alert covers interior and coastal districts, with conditions expected to intensify through the week.
Atmospheric Trigger Behind the Forecast
Meteorologists attribute the anticipated weather activity to an upper-air cyclonic circulation extending from the west-central Bay of Bengal to south Tamil Nadu through the southwest Bay of Bengal, persisting at altitudes between 3.1 km and 4.5 km above mean sea level. The system is sustaining favourable conditions for thundercloud formation, particularly over interior districts, which could produce scattered rainfall and localised heavy showers over the coming days.
District-Wise Alert for Monday and Tuesday
On Monday, isolated places in Tiruchirappalli, Perambalur, Ariyalur, Namakkal, and Salem districts are likely to experience moderate rain with thunderstorms and winds of up to 50 kmph.
By Tuesday, the weather department has warned of heavy rainfall and strong winds at isolated locations across a wider belt — Namakkal, Salem, Tiruchirappalli, Perambalur, Ariyalur, Kallakurichi, Thanjavur, Tiruvarur, and Mayiladuthurai. Residents in these areas have been advised to remain alert for disruptions. Ramanathapuram district is expected to face intense weather from Tuesday onwards, with heavy rain and thunderstorms in the forecast.
Chennai Outlook: Heat Without Relief
In Chennai, skies are expected to remain partly cloudy on Monday with no significant rainfall anticipated. Daytime temperatures are likely to touch around 39 degrees Celsius, continuing the oppressive heat conditions that have gripped the city. Both the Meenambakkam and Nungambakkam observatories recorded above-normal temperatures on Sunday.
Temperature Surge Across Tamil Nadu
Nagapattinam emerged as the hottest location in the state on Sunday, registering approximately 40 degrees Celsius. Madurai recorded around 39.5 degrees Celsius, while Tiruchirappalli touched nearly 39 degrees Celsius. The temperature at Madurai Airport was also close to 39 degrees Celsius. Oppressive heat conditions were similarly reported in Cuddalore, Karur Paramathi, Thanjavur, and the Union Territory of Puducherry and neighbouring Karaikal.
What to Watch in Coming Days
Meteorologists noted that the combination of high surface temperatures and the prevailing upper-air circulation could sustain thunderstorm activity over interior Tamil Nadu for several days. Residents in districts under alert are advised to stay updated on RMC advisories, avoid open areas during thunderstorm hours, and take precautions against gusty winds and localised flooding.
Point of View
But the breadth of the district-level alerts — spanning nine districts by Tuesday — is notable. What mainstream coverage often underplays is the risk to agricultural activity in the Cauvery delta belt, where Thanjavur, Tiruvarur, and Mayiladuthurai face both heat stress and sudden storm damage. The RMC advisory is precautionary, but the gap between forecast and ground-level preparedness in smaller districts remains a persistent concern during rapid weather transitions like this one.
NationPress
30 Jul 2026
Frequently Asked Questions
Which Tamil Nadu districts are under thunderstorm alert on 15 June?
Tiruchirappalli, Perambalur, Ariyalur, Namakkal, and Salem are under alert for moderate rain, thunderstorms, and winds up to 50 kmph on Monday, 15 June. The alert widens to include Kallakurichi, Thanjavur, Tiruvarur, and Mayiladuthurai on Tuesday.
What is causing the thunderstorms in Tamil Nadu?
An upper-air cyclonic circulation extending from the west-central Bay of Bengal to south Tamil Nadu, persisting at altitudes of 3.1 km to 4.5 km, is the primary trigger. High surface temperatures are aiding the formation of thunderclouds over interior districts.
What is the weather forecast for Chennai on 15 June?
Chennai is expected to have partly cloudy skies with no significant rainfall on Monday. The maximum temperature is likely to touch around 39 degrees Celsius, continuing the heat conditions recorded at Meenambakkam and Nungambakkam on Sunday.
Which was the hottest place in Tamil Nadu on Sunday?
Nagapattinam was the hottest location in Tamil Nadu on Sunday, recording approximately 40 degrees Celsius. Madurai followed at around 39.5 degrees Celsius, and Tiruchirappalli recorded nearly 39 degrees Celsius.
What precautions should residents in alerted districts take?
Residents in districts under the RMC alert have been advised to stay updated on weather advisories, avoid open areas during thunderstorm hours, and take precautions against gusty winds and the risk of localised flooding from heavy rainfall.
